143 lines
3.0 KiB
C
143 lines
3.0 KiB
C
/*
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* Copyright (c) 2019 Actinius
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT silabs_si7060
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#include <zephyr/device.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/sensor.h>
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#include <zephyr/logging/log.h>
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#include "si7060.h"
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#define SIGN_BIT_MASK 0x7F
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LOG_MODULE_REGISTER(si7060, CONFIG_SENSOR_LOG_LEVEL);
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struct si7060_data {
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uint16_t temperature;
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};
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struct si7060_config {
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struct i2c_dt_spec i2c;
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};
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static int si7060_reg_read(const struct device *dev, uint8_t reg, uint8_t *val)
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{
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const struct si7060_config *config = dev->config;
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if (i2c_reg_read_byte_dt(&config->i2c, reg, val)) {
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return -EIO;
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}
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return 0;
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}
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static int si7060_reg_write(const struct device *dev, uint8_t reg, uint8_t val)
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{
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const struct si7060_config *config = dev->config;
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return i2c_reg_write_byte_dt(&config->i2c, reg, val);
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}
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static int si7060_sample_fetch(const struct device *dev,
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enum sensor_channel chan)
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{
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struct si7060_data *drv_data = dev->data;
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if (si7060_reg_write(dev, SI7060_REG_CONFIG,
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SI7060_ONE_BURST_VALUE) != 0) {
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return -EIO;
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}
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int retval;
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uint8_t dspsigm;
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uint8_t dspsigl;
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retval = si7060_reg_read(dev, SI7060_REG_TEMP_HIGH, &dspsigm);
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retval += si7060_reg_read(dev, SI7060_REG_TEMP_LOW, &dspsigl);
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if (retval == 0) {
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drv_data->temperature = (256 * (dspsigm & SIGN_BIT_MASK))
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+ dspsigl;
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} else {
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LOG_ERR("Read register err");
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}
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LOG_DBG("Sample_fetch retval: %d", retval);
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return retval;
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}
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static int si7060_channel_get(const struct device *dev,
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enum sensor_channel chan,
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struct sensor_value *val)
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{
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struct si7060_data *drv_data = dev->data;
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int32_t uval;
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if (chan == SENSOR_CHAN_AMBIENT_TEMP) {
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uval = ((55 * 160) + (drv_data->temperature - 16384)) >> 4;
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val->val1 = uval / 10;
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val->val2 = (uval % 10) * 100000;
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LOG_DBG("Temperature = val1:%d, val2:%d", val->val1, val->val2);
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return 0;
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} else {
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return -ENOTSUP;
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}
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}
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static const struct sensor_driver_api si7060_api = {
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.sample_fetch = &si7060_sample_fetch,
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.channel_get = &si7060_channel_get,
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};
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static int si7060_chip_init(const struct device *dev)
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{
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const struct si7060_config *config = dev->config;
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uint8_t value;
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if (!device_is_ready(config->i2c.bus)) {
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LOG_ERR("Bus device is not ready");
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return -ENODEV;
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}
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if (si7060_reg_read(dev, SI7060_REG_CHIP_INFO, &value) != 0) {
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return -EIO;
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}
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if ((value >> 4) != SI7060_CHIP_ID_VALUE) {
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LOG_ERR("Bad chip id 0x%x", value);
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return -ENOTSUP;
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}
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return 0;
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}
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static int si7060_init(const struct device *dev)
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{
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if (si7060_chip_init(dev) < 0) {
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return -EINVAL;
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}
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return 0;
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}
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#define SI7060_DEFINE(inst) \
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static struct si7060_data si7060_data_##inst; \
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\
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static const struct si7060_config si7060_config_##inst = { \
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.i2c = I2C_DT_SPEC_INST_GET(inst), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(inst, si7060_init, NULL, \
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&si7060_data_##inst, &si7060_config_##inst, POST_KERNEL, \
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CONFIG_SENSOR_INIT_PRIORITY, &si7060_api); \
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DT_INST_FOREACH_STATUS_OKAY(SI7060_DEFINE)
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